One of the largest, belonging to a closely allied subgenus, is known as the "Flying Squirrel,"[1] from its being assisted, in its prodigious leaps from tree to tree, by a parachute formed by the skin of the flanks, which, on the extension of the limbs front and rear, is laterally expanded from foot to foot. Thus buoyed up in its descent, the spring which it is enabled to make from one lofty tree to another resembles the flight of a bird rather than the bound of a quadruped. [Footnote 1: Pteromys oral., _Tickel_. P. petaurista, _Pallas_.] Of these pretty creatures there are two species, one common to Ceylon and India, the other (_Sciuropterus Layardii_, Kelaart) is peculiar to the island, and by far the most beautiful of the family. _Rats_.--Among the multifarious inhabitants to which the forest affords at once a home and provender is the tree rat[1], which forms its nest on the branches, and by turns makes its visits to the dwellings of the natives, frequenting the ceilings in preference to the lower parts of houses. Here it is incessantly followed by the rat-snake[2], whose domestication is encouraged by the servants, in consideration of its services in destroying vermin. I had one day an opportunity of surprising a snake that had just seized on a rat of this description, and of covering it suddenly with a glass shade, before it had time to swallow its prey. The serpent, appeared stunned by its own capture, and allowed the rat to escape from its jaws, which cowered at one side of the glass in the most pitiable state of trembling terror. The two were left alone for some moments, and on my return to them the snake was as before in the same attitude of sullen stupor. On setting them at liberty, the rat bounded towards the nearest fence; but quick as lightning it was followed by its pursuer, which seized it before it could gain the hedge, through which I saw the snake glide with its victim in its jaws. In parts of the central province, at Oovah and Bintenne, the house-rat is eaten as a common article of food. The Singhalese believe it and the mouse to be liable to hydrophobia. [Footnote 1: There are two species of the tree rat in Ceylon: M. rufescens, _Gray_; (M. flavescens, _Elliot_;) and Mus nemoralis, _Blyth_.] [Footnote 2: Coryphodon Blumenbachii, _Merr_.] Another indigenous variety of the rat is that which made its appearance for the first time in the coffee plantations on the Kandyan hills in the year 1847; and in such swarms does it continue to infest them, at intervals, that as many as a thousand have been killed in a single day on one estate. In order to reach the buds and blossoms of the coffee, it cuts such of the slender branches as would not sustain its weight, and feeds on them when fallen to the ground; and so delicate and sharp are its incisors, that the twigs thus destroyed are detached by as clean a cut as if severed with a knife.